EP1663882B1 - Press bending station for the bending of glass sheets - Google Patents
Press bending station for the bending of glass sheets Download PDFInfo
- Publication number
- EP1663882B1 EP1663882B1 EP04783835.4A EP04783835A EP1663882B1 EP 1663882 B1 EP1663882 B1 EP 1663882B1 EP 04783835 A EP04783835 A EP 04783835A EP 1663882 B1 EP1663882 B1 EP 1663882B1
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- EP
- European Patent Office
- Prior art keywords
- mold
- full
- face
- press bending
- bending station
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- 238000005452 bending Methods 0.000 title claims description 82
- 239000011521 glass Substances 0.000 title claims description 82
- 238000000465 moulding Methods 0.000 claims description 30
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- 230000002093 peripheral effect Effects 0.000 claims description 9
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- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 229920002577 polybenzoxazole Polymers 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
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- 229910052782 aluminium Inorganic materials 0.000 claims description 2
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- 238000000034 method Methods 0.000 description 15
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- 230000003287 optical effect Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 5
- 238000007493 shaping process Methods 0.000 description 4
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
- C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
- C03B23/0357—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet by suction without blowing, e.g. with vacuum or by venturi effect
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
- C03B40/005—Fabrics, felts or loose covers
Definitions
- the invention relates to press bending of heated materials, with opposing bending tools that are moved toward and away from each other. More particularly, the invention relates to a press bending station for the bending of heated glass sheets, with two bending tools that are moved toward one another.
- an essentially solid male mold also known as a full-faced mold, forms one bending tool, while the other bending tool is designed as an annular or ring-type female mold.
- a plurality of suction holes are placed in portions of the full-face mold that are determined by the configuration of the annular mold when the annular mold comes into contact with a heated glass sheet during the press bending process.
- the negative pressure created is transmitted through the mold via the suction holes thus causing the glass sheet, for example, an automotive laminate, such as, a windshield, or a glass sheet, such as, a side lite or a back lite (that may be tempered subsequent to bending), to be drawn to the molding face.
- full-face mold denotes a bending mold against which the glass sheet lies over its full area during bending
- annular mold denotes one which supports the glass sheet only at the edge during bending.
- the glass sheet to be bent is heated to the bending temperature and brought in a deformable state between the two bending tools.
- the latter are then moved toward one another, whereby the extensive full-face mold presses the glass sheet onto the annular mold. Shaping of the edge of the sheet thus takes place.
- the middle area of the sheet is held by vacuum against the molding face in order to perform further shaping.
- a combination that has been particularly well tried and tested is one in which the annular mold is curved in a concave manner, while the full-face mold has a convex curvature.
- the annular mold normally forms the lower mold half, and the upper mold half can be moved vertically from above and towards the latter. Instead of this, it is also possible to move the annular mold towards the full-face mold or to move both bending tools toward one another.
- the glass sheet Following opening of, and removal from, the bending tools, the glass sheet should possess a desired shape, be dimensionally stable, and not be optically distorted. Otherwise, the bending process results in waste or products that possess poor quality.
- Some of the factors that influence the quality of the products produced by the bending process are: a) attaining and maintaining the deformable state, b) positioning and slipping of the glass sheet in the molds, c) speed of execution, d) controlling mold and/or tool contact with the glass sheet or molded part, and e) contamination of bending product surfaces.
- heat gained or lost by the glass sheet throughout the press bending process can cause the glass sheet to be incorrectly bent, to crack, break, optically distort, and/or dimensionally change shape and size. Varying surface contours of the full-face mold can make it difficult for the mold to properly hold, position, prevent slippage of, and release the glass sheet during the press bending process.
- Document EP 0 431 895 A2 demonstrates means for cooling the glass by inlet and outlet holes connected by a groove to circulate heated air away from the glass by the outlet holes and reinsert cool air through the inlet holes. Yet the press consists of full-face male and female molds. In order to detach the glass from the mold after the glass has been cooled via the circulation means, it is picked out of the mold by a suction apparatus.
- Document US 4 767 437 discloses a horizontal press bending arrangement which includes a plurality of holes in fluid connection with a straight line shaped slot to increase the strength of the suction force when pulling the sheets to be bent upon the press.
- a partial vacuum present at the mouths of the suction holes and slow execution of the bending process can produce in the glass sheet, as an unavoidable side-effect, local cooling zones which can impair the optical properties of the glass sheet at these points.
- the molding area of the full-face mold is kept free from suction holes. See EP 0 530 211 B1 which describes a full-face mold of the type mentioned at the outset.
- Molds and bending tools contacting the heated glass sheet can also induce physical or optical distortion of the product.
- particulates originating from a variety of process or external sources can mar and distort the glass sheet surface during the bending process.
- the glass sheet to be bent is heated prior to the press bending operation, for example, in or just outside of a glass sheet preheating furnace.
- the molds are heated by their own heat source, for example, electrically, with hot oil, air, or various other fluids. Even with these heating considerations, improvements in controlling the heating of the glass sheet could still be made.
- a second material for example, a stainless steel cloth, has been included between the mold and the glass sheet surfaces.
- the press bending process is still capable of improvement in respect of the bending speed, the bending accuracy, and the optical quality of the bent glass sheet produced with such molds.
- those skilled in the art continued to seek a solution to the problem of how to provide a better press bending station for the bending of heated materials and particularly glass sheets.
- the invention relates to a press bending station according to claim 1.
- the invention provides a full-face mold that includes at least some holes arranged in at least one groove, which can have various cross-sectional shapes.
- the groove or grooves are formed in a molding face on a major surface of the full-face mold.
- holes may be connected to a source of positive or negative pressure.
- a particularly preferred form of the invention is characterized by the fact that a number of holes are connected together by at least one groove formed in the molding face of the full-face mold.
- the middle area of the extensive full-face mold, and thus of the glass sheet preferably remains free from holes and the effects thereof, such as adversely affecting the optical quality in the viewing area of the glass sheet.
- a further advantageous effect of the groove(s) provided according to the invention lies in the fact that a partial vacuum is distributed not only very quickly, but also very uniformly over the molding face of the full-face mold. This also helps to promote the accuracy of the shaping.
- the positive effects of the at least one groove can be enhanced by the fact that the latter connects together as many as possible or even preferably all of the holes.
- all of the holes are connected by a single peripheral groove.
- several grooves separated from one another are provided, for example several individual grooves connecting up with one another along the annular area predetermined by an annular mold or, if several rows of suction holes are provided, grooves formed in parallel. It is very particularly preferred, however, for all suction holes arranged in a row to be connected together by precisely one groove.
- the groove/grooves with their holes is/are arranged approximately 5 to 20 mm from the outer edge of the glass sheet. This area is generally covered with an opaque frit or paint in finished glass sheets, and any impairments of the optical quality due to the removal by negative pressure are accordingly not as visible to the observer.
- flow channels in the molding face of the full-face mold inside the area enclosed by the holes.
- These flow channels can be connected in a radiating manner to the groove with its holes, for example in particularly critical areas with regard to bending of the glass sheet.
- flow channels can extend as single lines or cross-linked lines, with or without connection, to one of the grooves in the molding face.
- the depth and width of such flow channels lies in the range of 3-10 mm, preferably 4-6 mm, as in the case of the grooves.
- Through-holes are to be provided in the flow channels, through which the air enclosed by the adjacent glass sheet is able to flow away to the rear side of the mold.
- the bending tools each be covered with at least one air-permeable cloth, which is preferably made of special material, for example, stainless steel, fiber glass, poly para-phenyleneterephthalamide fibers (e.g., Kevlar”), materials blended with Kevlar” , polybenzoxazole (PBO) fibers containing graphite (e.g., Zylon”), and various weaves of these fibers.
- air permeable cloth helps to make the distribution of the partial vacuum and thus the removal by negative pressure uniform over the glass contact faces of the bending tools.
- the invention may be practiced having the molding face of the full-face mold covered by at least two cloths lying upon the other, whereby the cloth facing the glass sheet has a finer structure than the cloth lying next to the molding face of the full-face mold.
- the bending tool forming the full-face mold be made of ceramic, aluminum, stainless steel, or various other composites that include fused silicas and that, like the annular mold, it be heatable electrically, with hot oil, air, or various other fluids, or in some other way. Ceramic and the above-mentioned compositions of the full-face mold create a high quality molding surface and are wear resistant.
- the invention may address this condition by applying positive pressure to at least some of the holes. As a result, it has been found that the part is easily released from the full-face mold without physical intervention, reduction in product cycle time, or creation of quality defects.
- a plant according to figures 1 and 2 has a preheating furnace 1, which serves to preheat glass sheets 2 of a pair of glass sheets. Glass sheets 2 are transported on rollers 3, the spacing whereof is reduced in the area of the furnace exit, since the heated glass sheets are deformable and therefore require greater support.
- Preheating furnace 1 is followed by a bending station 4, which is provided with a bending tool designed as an annular mold 5 and a bending tool designed as a full-face mold 6. It may be noted that the bending station 4 may be positioned within the preheating furnace 1.
- the annular mold 5 is surrounded by a chamber 7, which serves to build up a gas cushion. Glass sheets 2 are transported onto this gas cushion as soon as they exit from preheating furnace 1.
- Chamber 7 is then lowered and places respective glass sheet 2 onto the annular mold 5.
- the full-face mold 6 is lowered in order to draw up by negative pressure respective glass sheet 2 and to bring it into the desired shape.
- the sheet 2 may be released from the full-face mold 6 by way of positive pressure being applied through the full-face mold 6.
- the press bending station may comprise more than two opposing molds 5, 6, may be oriented in a position other than vertical, have varying molds that move toward others, or have varying molds that are stationary.
- a conveying device 8 serves to transfer bent glass sheets 2 into a lehr 9.
- the invention takes effect in the press bending station 4, in which glass sheets 2 are bent. It is necessary here to draw off as quickly as possible the air between the molding face of the full-face mold 6 traveling in the direction of the annular mold 5 for the bending of heated and still deformable glass sheet 2.
- Figure 3 shows a first embodiment of the full-face mold 6 according to the invention in an enlarged representation, and in plan view from below.
- full-face mold 6 is in molding contact with the annular mold 5 (indicated only partially and diagrammatically). Glass sheet 2 is pressed between the annular mold 5 and full-face mold 6.
- a plurality of holes 10 which can be connected to a negative pressure source (not shown).
- the holes are connected jointly to a single negative pressure source, although a plurality of separate negative pressure sources is also quite conceivable.
- Holes 10 are all connected together by a groove 11 that may take varying cross-sectional shapes, with an annular course, formed in the molding face of the full-face mold 6.
- Groove 11 permits rapid removal by negative pressure of the air between the molding face of the full-face mold 6 and glass sheet 2 to be bent.
- FIG. 4 Another embodiment of the full-face mold 6, according to figure 4 , has the features of the embodiment previously described in fig. 3 .
- flow channels 15, pointing in a radiating manner to the middle of the full-face mold 6, are provided where the areas of the long sides of glass sheet 2 close to the corners, which are sometimes especially critical in bending, lie adjacent to the full-face mold 6. Said flow channels further facilitate the outflow of the enclosed air into groove 11.
- linear flow channels roughly in the shape of a horizontal H, which also cause an accelerated outflow of the air.
- the invention may encompass channel shapes other than that of the H shape. The shapes may be dictated by the form of the glass sheet that is to be molded on the mold face of the full-face mold 6. These flow channels 15, though being connected together, are not however connected to groove 11.
- flow channels 15 there are provided through-holes 16, through which the enclosed air can flow out via heating channels (not shown) in the full-face mold 6, without a connection to a negative pressure source being required for this.
- Figure 5 shows glass sheet 2 arranged between the full-face mold 6, the annular mold 5 and chamber 7 (only indicated here in an enlarged partial section, as a cross-sectional representation).
- the bending tools the annular mold 5 and the full-face mold 6
- glass sheet 2 have a small distance between one another in figure 5
- bending tools 5, 6 actually press glass sheet 2 between them during bending.
- Glass sheet 2 is provided on its upper side with a standard black screen-printed edge strip 12, having an equally standard fading dot pattern (merely indicated in figure 5 as a single dark rectangle to the left of strip 12) in the direction of the sheet center.
- groove 11 shown roughly square in cross-section, but not limited thereto, with a width and depth of preferably approximately 4-6 mm, but within the range of 3-10 mm, respectively, is arranged in the full-face mold 6 at a small distance, preferably approximately 5-20 mm, from the outer edge of glass sheet 2.
- the groove 11 construction is such that any optical defects originating from groove 11, or more precisely holes 10, are covered by screen-printed edge strip 12. Holes 10 lead into a hollow extraction chamber selectively connected to the negative pressure source, for drawing of the sheet 2 against the molding surface of the full-face mold 6, or to the positive pressure source, for release of the sheet 2 from the full-face mold 6, which is indicated only diagrammatically in the figure 5 .
- both bending tools 5, 6 are respectively covered by air-permeable cloths 14 and 13.
- Cloth 13 of the full-face mold 6 also contributes towards the air being able to be removed by negative pressure from the central area of the full-face mold 6 rapidly and uniformly via groove 11 and holes 10.
- the structure and thickness of cloths 13 and 14 are dimensioned such that impurity particles, for example, glass splinters, can be picked up in order to avoid damage to the surface of glass sheet 2.
- glass sheet 2 acquires its final shape by means of the press bending - apart from any elastic recovery caused by elastic restoring forces after the release from bending tools 5, 6. On account of the rapid cooling, it is necessary for glass sheet 2 to conform as quickly as possible to the molding face of the full-face mold 6. This is ensured by the measures according to the invention.
- the number of holes 10 required can be drastically reduced by the at least one groove 11 according to the invention.
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- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Description
- The invention relates to press bending of heated materials, with opposing bending tools that are moved toward and away from each other. More particularly, the invention relates to a press bending station for the bending of heated glass sheets, with two bending tools that are moved toward one another.
- Typically, in press bending, an essentially solid male mold, also known as a full-faced mold, forms one bending tool, while the other bending tool is designed as an annular or ring-type female mold. Also, in order to aid in the bending process, a plurality of suction holes are placed in portions of the full-face mold that are determined by the configuration of the annular mold when the annular mold comes into contact with a heated glass sheet during the press bending process.
- As described, when a source of vacuum is applied to the male mold, the negative pressure created is transmitted through the mold via the suction holes thus causing the glass sheet, for example, an automotive laminate, such as, a windshield, or a glass sheet, such as, a side lite or a back lite (that may be tempered subsequent to bending), to be drawn to the molding face. As used herein, full-face mold denotes a bending mold against which the glass sheet lies over its full area during bending, and annular mold denotes one which supports the glass sheet only at the edge during bending.
- The glass sheet to be bent is heated to the bending temperature and brought in a deformable state between the two bending tools. The latter are then moved toward one another, whereby the extensive full-face mold presses the glass sheet onto the annular mold. Shaping of the edge of the sheet thus takes place.
- At the same time, the middle area of the sheet is held by vacuum against the molding face in order to perform further shaping. These procedures have to take place relatively quickly, since the glass sheet cools down rapidly and after a short time the edge area of the glass sheet falls below the bending temperature.
- Various combinations of bending tools are conceivable. A combination that has been particularly well tried and tested is one in which the annular mold is curved in a concave manner, while the full-face mold has a convex curvature. The annular mold normally forms the lower mold half, and the upper mold half can be moved vertically from above and towards the latter. Instead of this, it is also possible to move the annular mold towards the full-face mold or to move both bending tools toward one another.
- Following opening of, and removal from, the bending tools, the glass sheet should possess a desired shape, be dimensionally stable, and not be optically distorted. Otherwise, the bending process results in waste or products that possess poor quality.
- Some of the factors that influence the quality of the products produced by the bending process are: a) attaining and maintaining the deformable state, b) positioning and slipping of the glass sheet in the molds, c) speed of execution, d) controlling mold and/or tool contact with the glass sheet or molded part, and e) contamination of bending product surfaces.
- Specifically, heat gained or lost by the glass sheet throughout the press bending process can cause the glass sheet to be incorrectly bent, to crack, break, optically distort, and/or dimensionally change shape and size. Varying surface contours of the full-face mold can make it difficult for the mold to properly hold, position, prevent slippage of, and release the glass sheet during the press bending process.
-
Document EP 0 431 895 A2 demonstrates means for cooling the glass by inlet and outlet holes connected by a groove to circulate heated air away from the glass by the outlet holes and reinsert cool air through the inlet holes. Yet the press consists of full-face male and female molds. In order to detach the glass from the mold after the glass has been cooled via the circulation means, it is picked out of the mold by a suction apparatus. - Document
US 4 767 437 discloses a horizontal press bending arrangement which includes a plurality of holes in fluid connection with a straight line shaped slot to increase the strength of the suction force when pulling the sheets to be bent upon the press. - A partial vacuum present at the mouths of the suction holes and slow execution of the bending process can produce in the glass sheet, as an unavoidable side-effect, local cooling zones which can impair the optical properties of the glass sheet at these points. In the case of the partial vacuum condition, the molding area of the full-face mold is kept free from suction holes. See
EP 0 530 211 B1 - Molds and bending tools contacting the heated glass sheet can also induce physical or optical distortion of the product. In addition, particulates originating from a variety of process or external sources can mar and distort the glass sheet surface during the bending process. Currently, the glass sheet to be bent is heated prior to the press bending operation, for example, in or just outside of a glass sheet preheating furnace. At times, the molds are heated by their own heat source, for example, electrically, with hot oil, air, or various other fluids. Even with these heating considerations, improvements in controlling the heating of the glass sheet could still be made.
- Also, it is still difficult to consistently and properly position, hold, and release the glass sheet at the mold surfaces, and to prevent slippage of the glass sheet during the press bending process. Further, opposite mold surfaces place pressure on product viewing areas, which can result in the localized cooling that may lead to physical or optical distortion.
- To minimize glass sheet surface distortion, due to process particulates being pressed between the mold and glass sheet surfaces, a second material, for example, a stainless steel cloth, has been included between the mold and the glass sheet surfaces.
- However, the press bending process is still capable of improvement in respect of the bending speed, the bending accuracy, and the optical quality of the bent glass sheet produced with such molds. Thus those skilled in the art continued to seek a solution to the problem of how to provide a better press bending station for the bending of heated materials and particularly glass sheets.
- The invention relates to a press bending station according to claim 1.
- Further objects and advantages of the invention will be apparent from the following description and appended claims, reference being made to the accompanying drawings forming a part of a specification, wherein like reference characters designate corresponding parts of several views.
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Figure 1 - in diagrammatic representation, a vertical section through a plant, into which a device according to the invention is integrated; -
Figure 2 - a plan view of the plant according tofigure 1 ; -
Figure 3 - a view from below of a first full-face mold according to the invention of a press bending station used in the plant according tofigs. 1 and2 ; -
Figure 4 - a view from below of a second full-face mold according to the invention or the press bending station used in the plant according tofigs. 1 and2 ; and -
Figure 5 - a partial section through bending tools used in the press bending station. - The invention provides a full-face mold that includes at least some holes arranged in at least one groove, which can have various cross-sectional shapes. The groove or grooves are formed in a molding face on a major surface of the full-face mold.
- In addition, the holes may be connected to a source of positive or negative pressure. A particularly preferred form of the invention is characterized by the fact that a number of holes are connected together by at least one groove formed in the molding face of the full-face mold.
- It has been shown that this relatively simple measure accelerates considerably the removal by negative pressure of the air between the molding face of the full-face mold and the glass sheet to be bent. The arrangement of holes in at least one groove means that a comparatively large volume of air can quickly be drawn away from the mold face, especially at the start of the removal by negative pressure, so that the glass sheet can lie substantially instantaneously next to the molding face of the full-face mold.
- This ensures that the press bending process takes place as close as possible to a prescribed bending temperature, so that the residual elasticity of the glass sheet lies in the specified range, and restoring forces during the cooling of the glass sheet do not lead thereafter to an undesired deviation from the intended shape of the glass sheet. Consistent with past practice, the middle area of the extensive full-face mold, and thus of the glass sheet, preferably remains free from holes and the effects thereof, such as adversely affecting the optical quality in the viewing area of the glass sheet.
- A further advantageous effect of the groove(s) provided according to the invention lies in the fact that a partial vacuum is distributed not only very quickly, but also very uniformly over the molding face of the full-face mold. This also helps to promote the accuracy of the shaping.
- The positive effects of the at least one groove can be enhanced by the fact that the latter connects together as many as possible or even preferably all of the holes. In a particularly preferred arrangement, all of the holes are connected by a single peripheral groove.
- In an embodiment of the invention several grooves separated from one another are provided, for example several individual grooves connecting up with one another along the annular area predetermined by an annular mold or, if several rows of suction holes are provided, grooves formed in parallel. It is very particularly preferred, however, for all suction holes arranged in a row to be connected together by precisely one groove.
- A width and depth or possibly a radius of several millimeters, preferably 4-6 mm but approximately in the range of 3-10 mm, has proved to be the most favorable cross-sectional dimensions of the groove.
- As mentioned earlier, it is advantageous to keep the middle area of the molding face free from the holes, in order not to adversely affect the optics of the glass sheet. Preferably, the groove/grooves with their holes is/are arranged approximately 5 to 20 mm from the outer edge of the glass sheet. This area is generally covered with an opaque frit or paint in finished glass sheets, and any impairments of the optical quality due to the removal by negative pressure are accordingly not as visible to the observer.
- The effectiveness of the arrangement according to the invention with holes arranged in at least one groove - whereby one groove preferably connects together a number of holes in each case - solely in the edge area of the extensive full-face mold, presupposes that an undisrupted and rapid removal of air by negative pressure also takes place from the middle area of the full-face mold. This can take place in different ways.
- It is thus proposed as an advantageous development of the invention to provide additional flow channels in the molding face of the full-face mold inside the area enclosed by the holes. These flow channels can be connected in a radiating manner to the groove with its holes, for example in particularly critical areas with regard to bending of the glass sheet. Alternatively, such flow channels can extend as single lines or cross-linked lines, with or without connection, to one of the grooves in the molding face.
- The depth and width of such flow channels lies in the range of 3-10 mm, preferably 4-6 mm, as in the case of the grooves. Through-holes are to be provided in the flow channels, through which the air enclosed by the adjacent glass sheet is able to flow away to the rear side of the mold.
- In a particularly preferred development of the invention, it is proposed that the bending tools each be covered with at least one air-permeable cloth, which is preferably made of special material, for example, stainless steel, fiber glass, poly para-phenyleneterephthalamide fibers (e.g., Kevlar"), materials blended with Kevlar" , polybenzoxazole (PBO) fibers containing graphite (e.g., Zylon"), and various weaves of these fibers. The use of such air permeable cloth helps to make the distribution of the partial vacuum and thus the removal by negative pressure uniform over the glass contact faces of the bending tools.
- The considerable improvement in the removal by negative pressure according to the invention by the provision of at least one groove permits the molding face of the full-face mold to be covered by only one fine mesh cloth rather than multiple layers of cloth made of wear-resistant air permeable materials. The cost saving thus arising is considerable.
- Further, the invention may be practiced having the molding face of the full-face mold covered by at least two cloths lying upon the other, whereby the cloth facing the glass sheet has a finer structure than the cloth lying next to the molding face of the full-face mold. Although not wishing to be held to any theory, it is thought that this helps to spare the surface of the glass sheet and at the same time improves the distribution of the partial vacuum.
- An important further favorable effect is achieved basically by the fact that the structure and the thickness of the cloth facing the glass sheet are adapted to the size of any impurity particles. Practice shows what particle size is to be expected. The structure and thickness of the cloths used is adapted accordingly. The particles are pulled into the cloths and thus prevented from causing damage to the glass surface, however small it may be.
- It is further proposed that the bending tool forming the full-face mold be made of ceramic, aluminum, stainless steel, or various other composites that include fused silicas and that, like the annular mold, it be heatable electrically, with hot oil, air, or various other fluids, or in some other way. Ceramic and the above-mentioned compositions of the full-face mold create a high quality molding surface and are wear resistant.
- Depending on the part produced and the molding conditions, it is at times difficult to release the part from the full-face mold at the completion of a molding cycle. The invention may address this condition by applying positive pressure to at least some of the holes. As a result, it has been found that the part is easily released from the full-face mold without physical intervention, reduction in product cycle time, or creation of quality defects.
- A plant according to
figures 1 and2 has a preheating furnace 1, which serves to preheatglass sheets 2 of a pair of glass sheets.Glass sheets 2 are transported onrollers 3, the spacing whereof is reduced in the area of the furnace exit, since the heated glass sheets are deformable and therefore require greater support. - Preheating furnace 1 is followed by a bending
station 4, which is provided with a bending tool designed as anannular mold 5 and a bending tool designed as a full-face mold 6. It may be noted that the bendingstation 4 may be positioned within the preheating furnace 1. Theannular mold 5 is surrounded by a chamber 7, which serves to build up a gas cushion.Glass sheets 2 are transported onto this gas cushion as soon as they exit from preheating furnace 1. - Chamber 7 is then lowered and places
respective glass sheet 2 onto theannular mold 5. At the same time, the full-face mold 6 is lowered in order to draw up by negative pressurerespective glass sheet 2 and to bring it into the desired shape. Upon completion of shaping theglass sheet 2, thesheet 2 may be released from the full-face mold 6 by way of positive pressure being applied through the full-face mold 6. - It may be appreciated that the press bending station may comprise more than two opposing
molds - Upon completion of the bending process, a conveying
device 8 serves to transferbent glass sheets 2 into alehr 9. However, the invention takes effect in thepress bending station 4, in whichglass sheets 2 are bent. It is necessary here to draw off as quickly as possible the air between the molding face of the full-face mold 6 traveling in the direction of theannular mold 5 for the bending of heated and stilldeformable glass sheet 2. -
Figure 3 shows a first embodiment of the full-face mold 6 according to the invention in an enlarged representation, and in plan view from below. During bending, full-face mold 6 is in molding contact with the annular mold 5 (indicated only partially and diagrammatically).Glass sheet 2 is pressed between theannular mold 5 and full-face mold 6. - In the molding face of full-
face mold 6, in an area predetermined by the configuration of theannular mold 5, there is formed a plurality ofholes 10, which can be connected to a negative pressure source (not shown). As a rule, the holes are connected jointly to a single negative pressure source, although a plurality of separate negative pressure sources is also quite conceivable. -
Holes 10 are all connected together by agroove 11 that may take varying cross-sectional shapes, with an annular course, formed in the molding face of the full-face mold 6.Groove 11 permits rapid removal by negative pressure of the air between the molding face of the full-face mold 6 andglass sheet 2 to be bent. As mentioned, it is possible to provide, instead of asingle groove 11, separate such grooves in which single or several holes are respectively arranged. - Another embodiment of the full-
face mold 6, according tofigure 4 , has the features of the embodiment previously described infig. 3 . In addition to groove 11, according to the invention,flow channels 15, pointing in a radiating manner to the middle of the full-face mold 6, are provided where the areas of the long sides ofglass sheet 2 close to the corners, which are sometimes especially critical in bending, lie adjacent to the full-face mold 6. Said flow channels further facilitate the outflow of the enclosed air intogroove 11. - Furthermore, there are, by way of example, provided in the middle area of the full-
face mold 6 additional linear flow channels roughly in the shape of a horizontal H, which also cause an accelerated outflow of the air. The invention may encompass channel shapes other than that of the H shape. The shapes may be dictated by the form of the glass sheet that is to be molded on the mold face of the full-face mold 6. Theseflow channels 15, though being connected together, are not however connected togroove 11. - In
flow channels 15 there are provided through-holes 16, through which the enclosed air can flow out via heating channels (not shown) in the full-face mold 6, without a connection to a negative pressure source being required for this. -
Figure 5 showsglass sheet 2 arranged between the full-face mold 6, theannular mold 5 and chamber 7 (only indicated here in an enlarged partial section, as a cross-sectional representation). Merely for the sake of clearer presentation, the bending tools (theannular mold 5 and the full-face mold 6) andglass sheet 2 have a small distance between one another infigure 5 , whereas bendingtools glass sheet 2 between them during bending. -
Glass sheet 2 is provided on its upper side with a standard black screen-printededge strip 12, having an equally standard fading dot pattern (merely indicated infigure 5 as a single dark rectangle to the left of strip 12) in the direction of the sheet center. It can be seen infigure 5 thatgroove 11, shown roughly square in cross-section, but not limited thereto, with a width and depth of preferably approximately 4-6 mm, but within the range of 3-10 mm, respectively, is arranged in the full-face mold 6 at a small distance, preferably approximately 5-20 mm, from the outer edge ofglass sheet 2. - The
groove 11 construction, as described, is such that any optical defects originating fromgroove 11, or more precisely holes 10, are covered by screen-printededge strip 12.Holes 10 lead into a hollow extraction chamber selectively connected to the negative pressure source, for drawing of thesheet 2 against the molding surface of the full-face mold 6, or to the positive pressure source, for release of thesheet 2 from the full-face mold 6, which is indicated only diagrammatically in thefigure 5 . - The
annular mold 5, like the full-face mold 6, projects slightly beyond the edge ofglass sheet 2. According to a preferred form of embodiment of the invention, bothbending tools permeable cloths -
Cloth 13 of the full-face mold 6 also contributes towards the air being able to be removed by negative pressure from the central area of the full-face mold 6 rapidly and uniformly viagroove 11 and holes 10. The structure and thickness ofcloths glass sheet 2. - As already described,
glass sheet 2 acquires its final shape by means of the press bending - apart from any elastic recovery caused by elastic restoring forces after the release from bendingtools glass sheet 2 to conform as quickly as possible to the molding face of the full-face mold 6. This is ensured by the measures according to the invention. - Upon completion of the molding cycle, positive pressure can be applied to the holes for release of the molded part. This reduces the need for physical intervention to release the part from the full-face mold which improves the quality of the parts produced.
- Whereas a large number of holes, on the order of 500, are required with conventional full-face molds in order to guarantee that the glass sheet would rapidly lie next to the full-face mold, the number of
holes 10 required can be drastically reduced by the at least onegroove 11 according to the invention. - Qualitatively excellent results have been achieved even with only approximately 40-80
holes 10 arranged inside agroove 11. The cost saving due to having to form fewer holes in the full-face mold means a considerable financial benefit due to reduced production outlay on the full-face mold 6.
Claims (15)
- A press bending station (4) having two opposing molds (5, 6) including a full-face mold (6) and an annular mold (5); the full-face mold (6) having a mold face with at least one peripheral annular groove (11) located in a surface thereof and at least one hole (10) defined in the annular groove, wherein the at least one hole (10) is in fluid communication with the at least one peripheral annular groove (11) and the at least one peripheral annular groove (11) is formed in a peripheral area of the full-face mold (6) that corresponds to the molding contact area where material is pressed between the full-face mold (6) and the annular mold (5).
- The press bending station of claim 1, wherein the at least one hole (10) is selectively connected to a negative pressure source for holding material to the full-face mold surface, thus allowing the material to be shaped into a part when the molds (5, 6) are urged together.
- The press bending station of claim 1, wherein the at least one hole (10) is selectively connected to a positive pressure source for releasing the material from the full-face mold.
- The press bending station of claim 1, wherein the material comprises a glass sheet (2).
- The press bending station of claim 1, wherein several holes (10) are connected together by the at least one peripheral groove (11) formed in the mold face of the full-face mold (6).
- The press bending station (4) of claim 5, wherein the at least one peripheral annular groove (11) is arranged approximately 5-20 mm from the outer edge of the glass sheet (2).
- The press bending station (4) of claim 6, wherein the depth and width of the at least one peripheral annular groove (11) are both in the range of 4-6 mm respectively.
- The press bending station (4) of claim 7, wherein additional flow channels (15) and through-holes (10) are provided in the molding face of the full-face mold (6) inside the area enclosed by the at least one peripheral annular groove (11).
- The press bending station (4) of claim 8, wherein the bending tools (5, 6) are each covered by at least one air-permeable cloth (13, 14)
- The press bending station (4) of claim 9, wherein the permeable cloth (13, 14) is chosen from a group of materials including stainless steel, fiber glass, poly paraphenyleneterephthalamide fibers, polybenzoxazole, graphite fibers, or blended weaves thereof.
- The press bending station (4) of claim 9, wherein the molding face of the full-face mold (6) is covered by two or more cloths (13, 14) lying one upon the other, whereby the cloth facing the glass sheet (2) has a finer structure than the cloth lying next to the molding face of the full-face mold (6).
- The press bending station (4) of claim 9, wherein the molding face of the full-face mold (6) is covered by only one cloth (13, 14).
- The press bending station (4) of claim 11, wherein the structure and the thickness of the cloth (13, 14) facing the glass sheet (2) is adapted to the size of any impurity particles.
- The press bending station (4) of claim 12, wherein the full-face mold (6) is chosen from the group consisting of ceramic, aluminum, stainless steel, compositions that include fused silicas, or combinations thereof.
- The press bending station (4) of claim 8, wherein the bending tools (5, 6) can be heated electrically, with hot oil, air, or other fluids.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL04783835T PL1663882T3 (en) | 2003-09-24 | 2004-09-13 | Press bending station for the bending of glass sheets |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/669,745 US7866187B2 (en) | 2003-09-24 | 2003-09-24 | Press bending station for the bending of glass sheets |
PCT/US2004/029771 WO2005033026A1 (en) | 2003-09-24 | 2004-09-13 | Press bending station for the bending of glass sheets |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1663882A1 EP1663882A1 (en) | 2006-06-07 |
EP1663882B1 true EP1663882B1 (en) | 2017-01-11 |
Family
ID=34313745
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP04783835.4A Active EP1663882B1 (en) | 2003-09-24 | 2004-09-13 | Press bending station for the bending of glass sheets |
Country Status (13)
Country | Link |
---|---|
US (1) | US7866187B2 (en) |
EP (1) | EP1663882B1 (en) |
JP (1) | JP4571137B2 (en) |
KR (1) | KR101106906B1 (en) |
CN (1) | CN1856451B (en) |
BR (1) | BRPI0413674B1 (en) |
CA (1) | CA2535049C (en) |
ES (1) | ES2622083T3 (en) |
HU (1) | HUE032034T2 (en) |
MX (1) | MXPA06003000A (en) |
PL (1) | PL1663882T3 (en) |
WO (1) | WO2005033026A1 (en) |
ZA (1) | ZA200601465B (en) |
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US5910854A (en) * | 1993-02-26 | 1999-06-08 | Donnelly Corporation | Electrochromic polymeric solid films, manufacturing electrochromic devices using such solid films, and processes for making such solid films and devices |
DE10314400A1 (en) * | 2003-03-28 | 2004-10-21 | Pilkington Automotive Deutschland Gmbh | Method and installation for treating the glass panes of an asymmetrical pair of glass panes |
DE10314408A1 (en) * | 2003-03-28 | 2004-10-07 | Pilkington Automotive Deutschland Gmbh | Device for generating a gas cushion |
JP5007044B2 (en) | 2005-12-21 | 2012-08-22 | 日本板硝子株式会社 | Method for forming bent glass plate and bent glass plate |
US7975509B2 (en) * | 2007-06-27 | 2011-07-12 | Pilkington North America, Inc. | Glass bending process |
CN101492238B (en) * | 2009-02-27 | 2011-05-18 | 桂林皮尔金顿安全玻璃有限公司 | Glass curve shaping system and use method thereof |
US9346701B2 (en) * | 2011-05-27 | 2016-05-24 | Pittsburgh Glass Works, Llc | Multi-stage glass pressing systems and methods |
US8924006B2 (en) | 2011-11-30 | 2014-12-30 | Corning Incorporated | Device and methods for picking and placing hot 3D glass |
WO2014109237A1 (en) * | 2013-01-11 | 2014-07-17 | 旭硝子株式会社 | Manufacturing method and manufacturing device for toughened glass |
ITTO20130687A1 (en) * | 2013-08-12 | 2015-02-13 | Istituto Naz Di Astrofisica | PROCESS FOR THE PRODUCTION OF AN OPTICAL ELEMENT BY MEANS OF HOT FORMING OF A GLASS SHEET |
GB201322240D0 (en) | 2013-12-16 | 2014-01-29 | Pilkington Group Ltd | Laminated glazing |
CN104803588B (en) * | 2014-01-26 | 2018-11-30 | 河南环宇玻璃科技股份有限公司 | Solid mould is used in a kind of molding of tempered glass |
GB201415163D0 (en) * | 2014-08-27 | 2014-10-08 | Pilkington Group Ltd | Laminated glazing |
CN107646023B (en) | 2015-05-27 | 2020-12-01 | 皮尔金顿集团有限公司 | Method and apparatus for shaping glass sheets |
US10308542B2 (en) * | 2015-06-26 | 2019-06-04 | Corning Incorporated | Apparatus and method for reforming sheet material |
WO2017178733A1 (en) * | 2016-04-13 | 2017-10-19 | Saint-Gobain Glass France | Glass sheet bending |
FR3050201B1 (en) * | 2016-04-13 | 2021-02-12 | Saint Gobain | GLASS SHEET BOMBING |
GB201708761D0 (en) | 2017-06-01 | 2017-07-19 | Pilkington Group Ltd | Method and apparatus for shaping a glass sheet |
FR3068349B1 (en) * | 2017-06-29 | 2021-10-29 | Saint Gobain | GLASS SHEET BOMBING INCLUDING LOCAL COOLING |
GB201812147D0 (en) | 2018-07-25 | 2018-09-05 | Pilkington Group Ltd | Process |
WO2020021269A1 (en) | 2018-07-25 | 2020-01-30 | Pilkington Group Limited | Process |
GB201911334D0 (en) | 2019-08-08 | 2019-09-25 | Pilkington Group Ltd | Method for shaping coated glass sheets |
CN111138075A (en) * | 2020-01-09 | 2020-05-12 | 瑞声通讯科技(常州)有限公司 | Forming die, forming equipment and processing method of glass product |
FR3111888B1 (en) * | 2020-06-26 | 2022-07-22 | Saint Gobain | Mold for bending glass sheets comprising a heating circuit and a cooling circuit |
CN113060929B (en) * | 2021-04-09 | 2022-12-20 | 福耀玻璃工业集团股份有限公司 | Automobile glass forming die and production method |
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2003
- 2003-09-24 US US10/669,745 patent/US7866187B2/en active Active
-
2004
- 2004-09-13 KR KR1020067005706A patent/KR101106906B1/en active IP Right Grant
- 2004-09-13 ZA ZA200601465A patent/ZA200601465B/en unknown
- 2004-09-13 CN CN2004800278134A patent/CN1856451B/en active Active
- 2004-09-13 EP EP04783835.4A patent/EP1663882B1/en active Active
- 2004-09-13 HU HUE04783835A patent/HUE032034T2/en unknown
- 2004-09-13 PL PL04783835T patent/PL1663882T3/en unknown
- 2004-09-13 BR BRPI0413674-8A patent/BRPI0413674B1/en active IP Right Grant
- 2004-09-13 JP JP2006528045A patent/JP4571137B2/en active Active
- 2004-09-13 ES ES04783835.4T patent/ES2622083T3/en active Active
- 2004-09-13 WO PCT/US2004/029771 patent/WO2005033026A1/en active Search and Examination
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CA2535049C (en) | 2012-07-10 |
EP1663882A1 (en) | 2006-06-07 |
ES2622083T3 (en) | 2017-07-05 |
KR20060094517A (en) | 2006-08-29 |
WO2005033026A1 (en) | 2005-04-14 |
PL1663882T3 (en) | 2017-08-31 |
US20050061034A1 (en) | 2005-03-24 |
CA2535049A1 (en) | 2005-04-14 |
BRPI0413674A (en) | 2006-10-24 |
JP2007506637A (en) | 2007-03-22 |
CN1856451A (en) | 2006-11-01 |
ZA200601465B (en) | 2007-06-27 |
US7866187B2 (en) | 2011-01-11 |
JP4571137B2 (en) | 2010-10-27 |
KR101106906B1 (en) | 2012-01-25 |
BRPI0413674B1 (en) | 2015-08-18 |
HUE032034T2 (en) | 2017-08-28 |
CN1856451B (en) | 2011-03-09 |
MXPA06003000A (en) | 2006-06-23 |
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